text1.asm

keilc程序+proteus+vb+串口调试

 ORG 30H
START: MOV   SP,#60H
         MOV SCON,#01010000B         
		 MOV TMOD,#20H
         ORL PCON,#10000000B
         MOV TH1,#0F3H
         MOV TL1,#0F3H
         SETB TR1
 AGAIN:  JNB RI,$
         CLR RI
         MOV A,SBUF
         MOV SBUF,A
         JNB TI,$
         CLR TI
         SJMP AGAIN
         END